<template>
  <div>
           <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品参数</el-breadcrumb-item>
    </el-breadcrumb>
  <!-- 卡片视图区域 -->
  <el-card>
    <!-- 头部的警告区域 -->
  <el-alert
    title="注意: 只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon>
  </el-alert>
  <!-- 选中商品分类区域 -->
  <el-row class="cat_opt">
    <el-col>
      <span>选择商品分类:</span>
      <!-- 级联选择框 -->
      <el-cascader
    v-model="selectedCateKeys"
    :options="catelist"
    :props="{ expandTrigger: 'hover',...cateProps }"
    @change="handleChange"></el-cascader>
    </el-col>
  </el-row>
  <!-- tab页签区域 -->
   <el-tabs v-model="activeName" @tab-click="handleClick">
   <!-- 添加动态参数的面版 -->
    <el-tab-pane label="动态参数" name="many">
      <!-- 添加参数的按钮 -->
      <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
      <!-- 动态参数表格 -->
      <el-table :data="manyTableData" border stripe>
      <!-- 展开行 -->
        <el-table-column type="expand" label="#">
          <template v-slot:default="{row}">
          <!-- 循环渲染tag标签 -->
            <el-tag v-for="(item,index) in row.attr_vals" :key="index" closable @close="handleClose(row,index)">{{item}}</el-tag>
            <!-- 输入文本框 -->
            <el-input
            class="input-new-tag"
            v-if="row.inputVisible"
            v-model="row.inputValue"
            ref="saveTagInput"
            size="small"
            @keyup.enter.native="handleInputConfirm(row)"
            @blur="handleInputConfirm(row)">
            </el-input>
          <!-- 添加按钮 -->
          <el-button
          v-else
          class="button-new-tag"
          size="small"
          @click="showInput(row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column  label="参数名称" prop="attr_name"></el-table-column>
        <el-table-column  label="操作">
          <template v-slot:default="{row}">
          <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(row.attr_id)">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete"  @click="removeParams(row.attr_id)">删除</el-button>
          </template>
        </el-table-column>

      </el-table>
      </el-tab-pane>
      <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
      <!-- 添加属性的按钮 -->
      <el-button type="primary" size="mini" :disabled="isBtnDisabled"  @click="addDialogVisible=true">动态参数</el-button>
      <!-- 静态属性表格 -->
          <!-- 动态参数表格 -->
      <el-table :data="onlyTableData" border stripe>
      <!-- 展开行 -->
       <!-- 展开行 -->
        <el-table-column type="expand" label="#">
          <template v-slot:default="{row}">
          <!-- 循环渲染tag标签 -->
            <el-tag v-for="(item,index) in row.attr_vals" :key="index" closable @close="handleClose(row,index)">{{item}}</el-tag>
            <!-- 输入文本框 -->
            <el-input
            class="input-new-tag"
            v-if="row.inputVisible"
            v-model="row.inputValue"
            ref="saveTagInput"
            size="small"
            @keyup.enter.native="handleInputConfirm(row)"
            @blur="handleInputConfirm(row)">
            </el-input>
          <!-- 添加按钮 -->
          <el-button
          v-else
          class="button-new-tag"
          size="small"
          @click="showInput(row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column  label="属性名称" prop="attr_name"></el-table-column>
        <el-table-column  label="操作">
          <template v-slot:default="{row}">
          <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(row.attr_id)">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete"  @click="removeParams(row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
      </el-tab-pane>
  </el-tabs>
  </el-card>
  <!-- 添加参数的对话框 -->
  <el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClosed">
<!-- 添加参数的对话框 -->
   <el-form
    :model="addForm"
     :rules="addFormRules"
      ref="addFormRef"
       label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
  <!-- 修改参数的对话框 -->
  <el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClosed">
<!-- 修改参数的对话框 -->
   <el-form
    :model="editForm"
     :rules="editFormRules"
      ref="editFormRef"
       label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  name: 'P-arams',
  data () {
    return {
      /* 商品分类列表 */
      catelist: [],
      /* 级联选择框的配置对象 */
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      /* 级联选择框双向绑定 */
      selectedCateKeys: '',
      /* 被激活的页签的名称 */
      activeName: 'many',
      /* 动态参数的数据 */
      manyTableData: [],
      /* 静态属性的数据 */
      onlyTableData: [],
      /* 控制添加对话框的显示和隐藏 */
      addDialogVisible: false,
      /* 添加参数的表单数据对象 */
      addForm: {},
      /* 表单的校验规则 */
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      /* 控制修改对话框的显示和隐藏 */
      editDialogVisible: false,
      /* 修改的表单数据对象 */
      editForm: {

      },
      /* 修改表单的验证规则 */
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      /* 控制按钮和文本框的切换显示 */
      inputVisible: false,
      /* 文本框输入的内容 */
      inputValue: ''
    }
  },
  methods: {
    /* 获取所有商品的分类列表 */
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.catelist = res.data
      // console.log(this.catelist)
    },
    /* 级联选择框的选中项变化就会变化 */
    handleChange () {
      this.getParamsData()
    },
    /* 这是tab页签的点击事件 */
    handleClick () {
      this.getParamsData()
    },
    /* 获取参数的列表数据 */
    async getParamsData () {
      /* 证明选中了三级分类 */
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
      }
      /* 发起数据请求 */
      /* 根据所选分类的id和当前所处的面板获取对应的参数 */
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
      /* 将数组数据分割 */
      res.data.forEach(item => {
        if (item.attr_vals.trim() !== '') {
          item.attr_vals = item.attr_vals.split(' ')
        } else {
          item.attr_vals = []
        }
        /* 添加一个布尔值 控制文本框的显示和隐藏 */
        item.inputVisible = false
        /* 文本框中输入的值 */
        item.inputValue = ''
      })
      console.log(res.data)
      /* 动态参数 */
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    /* 监听添加对话框的关闭事件 */
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    /* 点击按钮添加参数 */
    addParams () {
      this.$refs.addFormRef.validate(async vaiId => {
        if (!vaiId) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加参数')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    /* 点击按钮展示修改对话框 */
    async showEditDialog (attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: {
          attr_sel: this.activeName
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败')
      this.editDialogVisible = true
      this.editForm = res.data
    },
    /* 重置修改对话框的表单  */
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    /* 点击按钮修改参数信息 */
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    /* 根据id删除对应的参数项 */
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
      /* 删除的业务逻辑 */
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) return this.$message.info('删除参数失败')
      this.$message.info('删除参数成功')
      this.getParamsData()
    },
    /* 文本框失去焦点或者按下了回车键 */
    handleInputConfirm (row) {
      // console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      /* 如果没有return 则证明输入了内容,会做后续处理 */
      row.attr_vals.push(row.inputValue.trim())
      this.saveAttrVals(row)
      row.inputValue = ''
      row.inputVisible = false
    },
    /* 点击按钮展示文本输入框 */
    showInput (row) {
      row.inputVisible = true
      /* 让文本框自动获得焦点 */
      /*
      nextTick 方法的作用
      当页面上元素被重新渲染之后,才会执行回调函数
        */
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    /* 删除对应的参数和选项 */
    handleClose (row, index) {
      // console.log(index)
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    },
    /* 将对 attr_vals的操作保存到数据库在 */
    async saveAttrVals (row) {
      /* 发起网络请求 保存这次操作 */
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败')
      this.$message.success('修改参数项成功')
    }
  },
  /* 计算属性 */
  computed: {
    isBtnDisabled: {
      get () {
        /* true表示禁用 */
        if (this.selectedCateKeys.length !== 3) {
          return true
        }
        return false
      },
      set () {

      }
    },
    /* 当前选中的三级分类id */
    cateId: {
      get () {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      }
    },
    /* 动态计算标题的文本 */
    titleText: {
      get () {
        if (this.activeName === 'many') { return '动态参数' }
        return '静态属性'
      }
    }
  },
  created () {
    this.getCateList()
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
